diff options
Diffstat (limited to 'src/soc/intel/common/mrc_cache.c')
| -rw-r--r-- | src/soc/intel/common/mrc_cache.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/soc/intel/common/mrc_cache.c b/src/soc/intel/common/mrc_cache.c index 5860201477..f854046459 100644 --- a/src/soc/intel/common/mrc_cache.c +++ b/src/soc/intel/common/mrc_cache.c @@ -247,6 +247,25 @@ mrc_cache_next_slot(const struct mrc_data_region *region, return next_slot; } +/* Protect RW_MRC_CACHE region with a Protected Range Register */ +static int protect_mrc_cache(const struct mrc_data_region *region) +{ +#if IS_ENABLED(CONFIG_MRC_SETTINGS_PROTECT) + if (nvm_is_write_protected() <= 0) { + printk(BIOS_INFO, "NOT enabling PRR for RW_MRC_CACHE region\n"); + return 1; + } + + if (nvm_protect(region->base, region->size) < 0) { + printk(BIOS_ERR, "ERROR setting PRR for RW_MRC_CACHE region\n"); + return -1; + } + + printk(BIOS_INFO, "Enabled Protected Range on RW_MRC_CACHE region\n"); +#endif + return 0; +} + static void update_mrc_cache(void *unused) { const struct mrc_saved_data *current_boot; @@ -279,6 +298,7 @@ static void update_mrc_cache(void *unused) !memcmp(¤t_saved->data[0], ¤t_boot->data[0], current_saved->size)) { printk(BIOS_DEBUG, "MRC cache up to date.\n"); + protect_mrc_cache(®ion); return; } } @@ -301,6 +321,7 @@ static void update_mrc_cache(void *unused) printk(BIOS_DEBUG, "Failure writing MRC cache to %p.\n", next_slot); } + protect_mrc_cache(®ion); } BOOT_STATE_INIT_ENTRY(BS_WRITE_TABLES, BS_ON_ENTRY, update_mrc_cache, NULL); |